我使用过的 Angular 版本 - Angular 4.2.0
Angular 4 提出了 ComponentFactoryResolver 来在运行时加载组件。这是 Angular 1.0 中 $compile 的一种相同实现，可以满足您的需求
在下面的示例中，我将 ImageWidget 组件动态加载到 DashboardTileComponent
为了加载一个组件，您需要一个可以应用于 ng-template 的指令，这将有助于放置动态组件
WidgetHostDirective
import { Directive, ViewContainerRef } from '@angular/core';
@Directive({
selector: '[widget-host]',
})
export class DashboardTileWidgetHostDirective {
constructor(public viewContainerRef: ViewContainerRef) {
}
}
该指令注入 ViewContainerRef 以访问将托管动态添加的组件的元素的视图容器。
DashboardTileComponent（占位符组件渲染动态组件）
此组件接受来自父组件的输入，或者您可以根据您的实现从您的服务中加载。该组件在运行时解决组件的主要作用。在这个方法中，您还可以看到一个名为 renderComponent() 的方法，它最终从服务中加载组件名称并使用 ComponentFactoryResolver 进行解析，最后将数据设置为动态组件。
import { Component, Input, OnInit, AfterViewInit, ViewChild, ComponentFactoryResolver, OnDestroy } from '@angular/core';
import { DashboardTileWidgetHostDirective } from './DashbardWidgetHost.Directive';
import { TileModel } from './Tile.Model';
import { WidgetComponentService } from "./WidgetComponent.Service";
@Component({
selector: 'dashboard-tile',
templateUrl: 'app/tile/DashboardTile.Template.html'
})
export class DashboardTileComponent implements OnInit {
@Input() tile: any;
@ViewChild(DashboardTileWidgetHostDirective) widgetHost: DashboardTileWidgetHostDirective;
constructor(private _componentFactoryResolver: ComponentFactoryResolver,private widgetComponentService:WidgetComponentService) {
}
ngOnInit() {
}
ngAfterViewInit() {
this.renderComponents();
}
renderComponents() {
let component=this.widgetComponentService.getComponent(this.tile.componentName);
let componentFactory = this._componentFactoryResolver.resolveComponentFactory(component);
let viewContainerRef = this.widgetHost.viewContainerRef;
let componentRef = viewContainerRef.createComponent(componentFactory);
(<TileModel>componentRef.instance).data = this.tile;
}
}
DashboardTileComponent.html
<div class="col-md-2 col-lg-2 col-sm-2 col-default-margin col-default">
<ng-template widget-host></ng-template>
</div>
WidgetComponentService
这是一个服务工厂，用于注册您要动态解析的所有组件
import { Injectable } from '@angular/core';
import { ImageTextWidgetComponent } from "../templates/ImageTextWidget.Component";
@Injectable()
export class WidgetComponentService {
getComponent(componentName:string) {
if(componentName==="ImageTextWidgetComponent"){
return ImageTextWidgetComponent
}
}
}
ImageTextWidgetComponent（我们在运行时加载的组件）
import { Component, OnInit, Input } from '@angular/core';
@Component({
selector: 'dashboard-imagetextwidget',
templateUrl: 'app/templates/ImageTextWidget.html'
})
export class ImageTextWidgetComponent implements OnInit {
@Input() data: any;
constructor() { }
ngOnInit() { }
}
添加 最后将此 ImageTextWidgetComponent 作为 entryComponent 添加到您的应用模块中
@NgModule({
imports: [BrowserModule],
providers: [WidgetComponentService],
declarations: [
MainApplicationComponent,
DashboardHostComponent,
DashboardGroupComponent,
DashboardTileComponent,
DashboardTileWidgetHostDirective,
ImageTextWidgetComponent
],
exports: [],
entryComponents: [ImageTextWidgetComponent],
bootstrap: [MainApplicationComponent]
})
export class DashboardModule {
constructor() {
}
}
TileModel
export interface TileModel {
data: any;
}
Orginal Reference from my blog
Official Documentation
Download Sample Source Code